Usually an older person around their fourties who enjoys hitting on and or making flirtacious and awkward comments to one who is far younger than them. Related to a cougar and a dirty old man. Except they are worse because they are terrible at hiding what they do and make it extremely obvious even to the person's significant other. They tend to be quite stupid as well.

A: "The barbie beezy at my boyfriends work was trying to hit on him while I was there! She's like in her fourties and completely plastic"

"EW what a predaphile!!"

"Yeah, no kidding. I wanted to punch her in the fake boob. I wonder if they'd pop!"

"They probably would..."

B: Predaphile-"so aren't you getting that tattoo soon"

Young man-"umm....why were you listening in on my conversation with my brother?"

This guy Joey got on the internet and started to view children as prey and himself as a predator, he figured since he's a predator and a pedophile he might as well combine the two words and call himself a predaphile.